Currently, I don't believe we had any Half Life Models, but i'm sure if you just post a request (like you just did) and I'm sure some of the modelers in the community will get the models to you as soon as possible. Sfunk is really good at creating models and converting.

Well all depends on what models the user wants, you have to be a little more specific, since most of the weapons from the games are just normal weapons that can be found in arty's object pack, and the gravity gun is the same thing as the portal gun which is somewhere floating around the community. and character objects is where you would actually have to have someone convert or model an object for you. i wouldn't mind doing it, although I rarely have the time to work on modeling anymore. So if it is high priority(like will you actually create a game with the models with decent quality and effort) then I may try to do something for you.

If you are stuck on a project, check out the tutorials I made here at this link:

http://alice.org/community/showthread.php?p=36778#post36778

There are lots of tutorials on it so far, including some youtube videos, check it out

Or..

Go to my youtube channel to check out my alice 2.2 tutorials I have there..